. The practical telephone handbook and guide to the telephonic exchange . Full Size Fig. 133a ing a current to flow in one direction only, namely—from thesolution to the plate. With two aluminium electrodes thecurrent is completely blocked. The electrolytic action causesthe deposit on the plates of a very thin (about 00005 inch)insulating film. The plates and surface of the electrolyte SUB-STATION INSTRUMENT CONNECTIONS 123 form the plates of a condenser, separated only by the verythin films, and this close proximity gives a very large capacityin proportion to the area ofthe plates. The W. W.

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. The practical telephone handbook and guide to the telephonic exchange . Full Size Fig. 133a ing a current to flow in one direction only, namely—from thesolution to the plate. With two aluminium electrodes thecurrent is completely blocked. The electrolytic action causesthe deposit on the plates of a very thin (about 00005 inch)insulating film. The plates and surface of the electrolyte SUB-STATION INSTRUMENT CONNECTIONS 123 form the plates of a condenser, separated only by the verythin films, and this close proximity gives a very large capacityin proportion to the area ofthe plates. The W. W. DeanSystein.—Fig. 133a repre-sents an interesting sub-station circuit used inAmerica. The receiver, itwill be seen, is connected asthe bridge to four resistances joined like those of aWheatstone bridge (forwhich see ChapterXXVIII.). Two of theresistances are non-induc-tive, and two are retarda-tion coils, which stop therapid-speaking currents, sothat these pass through thereceiver and the non-induc-tive resistances. The steadyfeeding current from thecentral battery

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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttelephone, bookyear19